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NTS


Aug
31
comment most common subsets
You should change subgroup to subset. A subgroup is something different.
Aug
29
answered What topology is inherited by a line in $\mathbb{R}_l \times \Bbb{R}$?
Aug
29
comment Mapping a plane in $\Bbb R^3$ to $\Bbb R^2$
@Colin it makes sense, yes :)
Aug
29
answered Mapping a plane in $\Bbb R^3$ to $\Bbb R^2$
Aug
29
answered Recommended math background for game theory
Aug
26
answered proving the Klein 4 group is abelian
Aug
25
answered Intuition behind “If P then Q” = “Q or Not P ”
Aug
24
answered get a rotation matrix from an oriented vector quicker than Euler
Aug
24
comment Re-write arguments between $(-\pi,\pi]$ - why
Yes, that's the principal value. It has no particular significance... it's just a convention. I don't know what else to say I'm sorry, but it's that, a convention, we could have chosen, instead of $(-\pi,\pi]$, maybe $(2.83,2.83+2\pi]$, as silly as it could have been.
Aug
24
comment Find the domain and range of $y=\cos^{-1} \sqrt{1-x}$
The Note is not true, if both extremes have the same value, for example the function $$\sin(\sqrt{\pi-|x|})$$ The domain is $[-\pi,\pi]$, both values gives the same result because the function is even, but the range is $[0,1]$
Aug
24
comment Re-write arguments between $(-\pi,\pi]$ - why
There's is no need to change... It's just convention whether to use one or another. In some fields one is most extended than the other, but they're the same thing. When you go to calculate it, it doesn't change because it's an argument, and it's the sine and cosine of the argument which determine the complex numbers $a+bi=|z|(\cos\phi+i\sin\phi)$, so adding or substracting $2\pi$ doesn't change the result because those functions are $2\pi\text{-periodic}$
Aug
24
comment Find the domain and range of $y=\cos^{-1} \sqrt{1-x}$
@RedQueen10101 mmm... yes. Is there anything you don't understand? You should have posted the problems you have in the question.
Aug
24
answered Find the domain and range of $y=\cos^{-1} \sqrt{1-x}$
Aug
24
comment Probability of intersection of two sets of numbers
@eltanin Basic combinatorics and probability calculus I'd say.
Aug
24
answered Re-write arguments between $(-\pi,\pi]$ - why
Aug
24
accepted What's the meaning of $\dagger$
Aug
24
comment What's the meaning of $\dagger$
@Blue Ok, I'll do it, I'll just accept another "close" one, because it won't let me accept my own answer for a couple os days and this way I get it out sooner.
Aug
23
revised What's the meaning of $\dagger$
added 59 characters in body
Aug
23
comment What's the meaning of $\dagger$
@BabakS. Maybe.
Aug
23
comment What's the meaning of $\dagger$
There is no footnote. I hope it's not the irrelevant information of the person being dead, because I'm now seeing a "Gauss ($\dagger$)"